<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>css_外前样式表</title>
    <style>
        body {background-color: #05B2D2 }
    </style>
        <link rel="stylesheet" href="./css_外部嵌套样式1.css">

</head>
<body>
<h1>标题</h1>
<div>
    <p>正文小标题</p>
    <hr>
    <strong>正文着重</strong>
</div>
</body>
</html>